<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    
</head>
<body>
    <button>按钮1</button>
    <button>按钮2</button>
    <button>按钮3</button>
    <script>
        var btns = document.querySelectorAll("button")
        btns.forEach(function(btn){
            btn.onclick = function(){
                this.disabled = true
                setTimeout(function(){
                    this.disabled =false
                }.bind(this),2000)
            }
        })
    </script>
</body>
</html>